Added papermc config

stacks/paper/Dockerfile

@@ -0,0 +1,50 @@
+ARG BASE_IMAGE
+
+# We use ${:-} instead of a default value because the argument is always passed
+# to the build, it'll just be blank most likely
+FROM ${BASE_IMAGE:-'openjdk:17-slim'}
+
+# Build arguments
+ARG MC_VERSION
+ARG PAPERMC_VERSION
+
+# Install mcstatus for healthchecks
+RUN apt update && \
+    apt install --no-install-recommends -y python3-minimal python3-setuptools python3-pip && \
+    python3 -m pip install mcstatus && \
+    apt --purge remove -y python3-pip python3-setuptools && \
+    apt clean && \
+    groupadd -g 1000 paper && \
+    useradd -rMg paper -u 1000 paper
+
+# Create worlds and config directory
+WORKDIR /app
+RUN mkdir -p worlds config/cache
+
+# Download server file
+ADD "https://papermc.io/api/v2/projects/paper/versions/$MC_VERSION/builds/$PAPERMC_VERSION/downloads/paper-$MC_VERSION-$PAPERMC_VERSION.jar" server.jar
+
+# Make sure the server user can access all necessary folders
+RUN chown -R paper:paper /app
+
+# Store the cache in an anonymous volume, which means it won't get stored in the other volumes
+VOLUME /app/config/cache
+
+# Default value to keep users from eating up all ram accidentally
+ENV XMX=4
+ENV MC_VERSION="${MC_VERSION}"
+ENV PAPERMC_VERSION="${PAPERMC_VERSION}"
+
+# Document exposed ports
+EXPOSE 25565
+
+# Switch to non-root user
+USER paper:paper
+
+# Entrypoint runs in /app/config
+COPY entrypoint.sh /entrypoint.sh
+WORKDIR /app/config
+ENTRYPOINT /entrypoint.sh
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=1m --retries=5 \
+    CMD mcstatus localhost:25565 ping